US9041067B2 - Integrated half-bridge circuit with low side and high side composite switches - Google Patents
Integrated half-bridge circuit with low side and high side composite switches Download PDFInfo
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- US9041067B2 US9041067B2 US14/168,926 US201414168926A US9041067B2 US 9041067 B2 US9041067 B2 US 9041067B2 US 201414168926 A US201414168926 A US 201414168926A US 9041067 B2 US9041067 B2 US 9041067B2
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Definitions
- III-Nitride or “III-N” refers to a compound semiconductor that includes nitrogen and at least one group III element such as aluminum (Al), gallium (Ga), indium (In), and boron (B), and including but not limited to any of its alloys, such as aluminum gallium nitride (Al x Ga (1-x) N), indium gallium nitride (In y Ga (1-y) N), aluminum indium gallium nitride (Al x In y Ga (1-x-y) N), gallium arsenide phosphide nitride (GaAs a P b N (1-a-b) ), aluminum indium gallium arsenide phosphide nitride (Al x In y Ga (1-x-y) As a P b N (1-a-b) ), for example.
- group III element such as aluminum (Al), gallium (Ga), indium (In), and boron (B)
- III-N also refers generally to any polarity including but not limited to Ga-polar, N-polar, semi-polar, or non-polar crystal orientations.
- a III-N material may also include either the Wurtzitic, Zincblende, or mixed polytypes, and may include single-crystal, monocrystalline, polycrystalline, or amorphous structures.
- Gallium nitride or GaN refers to a III-N compound semiconductor wherein the group III element or elements include some or a substantial amount of gallium, but may also include other group III elements in addition to gallium.
- a III-N or a GaN transistor may also refer to a composite high voltage enhancement mode transistor that is formed by connecting the III-N or the GaN transistor in cascode with a lower voltage group IV transistor.
- group IV refers to a semiconductor that includes at least one group IV element such as silicon (Si), germanium (Ge), and carbon (C), and may also include compound semiconductors such as silicon germanium (SiGe) and silicon carbide (SiC), for example.
- group IV also refers to semiconductor materials which include more than one layer of group IV elements, or doping of group IV elements to produce strained group IV materials, and may also include group IV based composite substrates such as silicon on insulator (SOI), separation by implantation of oxygen (SIMOX) process substrates, and silicon on sapphire (SOS), for example.
- SOI silicon on insulator
- SIMOX separation by implantation of oxygen
- SOS silicon on sapphire
- the terms “low voltage” or “LV” in reference to a transistor or switch describes a transistor or switch with a voltage range of up to approximately fifty volts (50V). It is further noted that use of the term “midvoltage” or “MV” refers to a voltage range from approximately fifty volts to approximately two hundred volts (approximately 50V to 200V). Moreover, the term “high voltage” or “HV,” as used herein, refers to a voltage range from approximately two hundred volts to approximately twelve hundred volts (approximately 200V to 1200V), or higher.
- III-N field-effect transistors for example III-N heterostructure FETs (HFETs) such as gallium nitride (GaN) based high mobility electron transistors (HEMTs), are often desirable for their high efficiency and high-voltage operation. Moreover, it is often desirable to combine such III-N FETs with other FETs, such as silicon or other group IV FETs, to create high performance composite switches.
- HFETs III-N heterostructure FETs
- GaN gallium nitride
- HEMTs high mobility electron transistors
- a depletion mode (normally ON) III-N FET can be cascoded with an enhancement mode (normally OFF) low-voltage (LV) group IV FET to produce an enhancement mode (normally OFF) composite power switch.
- Two such normally OFF composite power switches may then be used to implement a half-bridge circuit in which one composite switch functions as a high side switch, and the other composite switch operates as the low side switch.
- the half-bridge circuit design described above requires the use of four FETs to implement two composite power switches.
- the present disclosure is directed to an integrated half-bridge circuit with low side and high side composite switches, substantially as shown in and/or described in connection with at least one of the figures, and as set forth more completely in the claims.
- FIG. 1 shows an exemplary integrated half-bridge circuit including low side and high side composite switches.
- FIG. 2A shows a diagram of an exemplary composite switch.
- FIG. 2B shows a structure capable of implementing the exemplary composite switch of FIG. 2A .
- FIG. 3 shows an integrated half-bridge circuit with low side and high side composite switches, according to one implementation.
- FIG. 4 shows an integrated half-bridge circuit with low side and high side composite switches, according to another implementation.
- III-N transistors such as field-effect transistors (FETs) fabricated from III-N materials
- FETs field-effect transistors
- III-N materials include, for example, gallium nitride (GaN) and its alloys such as aluminum gallium nitride (AlGaN), indium gallium nitride (InGaN), and aluminum indium gallium nitride (AlInGaN).
- III-N materials are semiconductor compounds having a relatively wide, direct bandgap and strong piezoelectric polarizations, and can enable high breakdown fields, high saturation velocities, and the creation of two-dimensional electron gases (2DEGs), when formed in certain stacked layer configurations.
- 2DEGs two-dimensional electron gases
- III-N materials such as GaN are used in many microelectronic applications as depletion mode (i.e., normally ON) and enhancement mode (i.e., normally OFF) power FETs.
- III-N FETs may be used as low side and high side power switches in a half-bridge circuit.
- a half-bridge circuit is a switch configuration used in power management applications and will be described in greater detail below.
- normally OFF characteristics of the power switches used in the half-bridge circuit may be required, a depletion mode III-N FET can be cascoded with a low-voltage (LV) enhancement mode silicon or other normally OFF FET to produce a normally OFF composite switch.
- LV low-voltage
- Such a configuration allows for use of the LV FET to control the flow of current through the composite switch, thereby conferring several advantages of the LV Group IV FET to the composite switch. Examples of those advantages include robust and reliable gate drive behavior, and the relatively low gate turn-off current associated with LV silicon or other LV group IV FETs.
- FIG. 1 shows power management circuit 100 including integrated half-bridge circuit 110 .
- power management circuit 100 further includes high voltage rail 102 and low voltage rail 104 .
- Integrated half-bridge circuit 110 includes a low side switch and a high side switch coupled by switch node 112 .
- the low side switch takes the form of low side composite switch 120 b coupled to low voltage rail 104
- the high side switch takes the form of high side composite switch 120 a coupled to high voltage rail 102 .
- low side composite switch 120 b is coupled to high side composite switch 120 a to provide switch node 112 .
- integrated half-bridge circuit 110 including low side composite switch 120 b and high side composite switch 120 a is coupled between low voltage rail 104 and high voltage rail 102 , and provides an output from switch node 112 .
- low side composite switch 120 b of integrated half-bridge circuit 110 includes III-N FET 130 b and group IV FET 140 b cascoded with III-N FET 130 b .
- high side composite switch 120 a of integrated half-bridge circuit 110 includes III-N FET 130 a and group IV FET 140 a cascaded with III-N FET 130 a .
- composite switches suitable for use as low side composite switch 120 b and/or high side composite switch 120 a it is noted that several composite devices are disclosed in U.S. patent application Ser. No. 12/928,103, entitled “Monolithic Integration of Silicon and Group III-V Devices,” and filed on Dec. 3, 2010, as well as in U.S. Pat.
- FIG. 2A shows a diagram of exemplary composite switch 220 suitable for use as either or both of low side composite switch 120 b and high side composite switch 120 a , in FIG. 1 .
- composite switch 220 includes III-N FET 230 , and group IV FET 240 cascoded with III-N FET 230 .
- composite source 224 , composite drain 222 , and composite gate 226 of composite switch 220 are also shown in FIG. 2A , as well as source 234 , drain 232 , and gate 236 of III-N FET 230 , and body diode 248 , source 244 , drain 242 , and gate 246 of group IV FET 240 .
- Group III-V FET 230 may be a normally ON III-N power FET and may be implemented as a depletion mode heterostructure FET (HFET), for example.
- III-N FET 230 may take the form of a depletion mode high electron mobility transistor (HEMT) configured to incorporate a 2DEG.
- HEMT high electron mobility transistor
- III-N FET 230 may be a high-voltage (HV) FET, as defined above in the Definition section. It is noted that in some implementations, III-N FET 230 may be a midvoltage (MV) FET or an LV FET, as also defined above in the Definition section, so long as group IV FET 240 (described below) is selected appropriately.
- Group IV FET 240 may be implemented as an LV group IV FET, as defined above in the Definition section.
- group IV FET 240 may be an LV vertical channel FET, such as a normally OFF silicon trench type vertical channel FET, for example.
- group IV FET 240 may be implemented as a lateral channel, or planar, LV FET.
- group IV FET 240 may be a silicon MISFET or MOSFET, for example.
- group IV FET 240 may include any suitable group IV material, such as silicon carbide (SiC), germanium (Ge), silicon germanium (SiGe), or a strained group IV element or compound, for example.
- III-N FET 230 and group IV FET 240 provides composite switch 220 , which according to the implementation shown in FIG. 2A can be configured as a composite three terminal switch functioning in effect as a normally OFF composite FET having composite source 224 and composite gate 226 provided by group IV FET 240 , and composite drain 222 provided by III-N FET 230 . That is to say, drain 242 of group IV FET 240 is coupled to source 234 of III-N FET 230 , source 244 of group IV FET 240 provides composite source 224 for composite switch 220 , and gate 246 of group IV FET 240 provides composite gate 226 for composite switch 220 . Moreover, drain 232 of III-N FET 230 provides composite drain 222 for composite switch 220 , while gate 236 of III-N FET 230 is coupled to source 244 of group IV FET 240 .
- composite switch 220 implemented as an enhancement mode (normally OFF) switch formed from normally OFF group IV FET 240 cascoded with depletion mode (normally ON) III-N FET 230 will now be described by reference to specific, but merely exemplary, parameters.
- a few volts e.g., approximately 10 V
- This voltage is inverted and applied to gate 236 of III-N FET 230 (e.g., as an approximately ⁇ 10 V gate voltage).
- III-N FET 230 will turn OFF (e.g., assuming a pinch-off voltage magnitude of approximately 10 V) and any additional increase in the drain voltage at composite drain 222 will be sustained across drain 232 and source 234 of III-N FET 230 .
- group IV FET 240 including body diode 248 will typically not be required to sustain a voltage beyond the first few volts (e.g., approximately 10 V) applied to composite drain 222 .
- FIG. 2B shows a structure capable of implementing the exemplary composite switch of FIG. 2A .
- FIG. 2B is an example of use of vertical integration to stack group IV FET 240 on top of III-N FET 230 to form composite switch 220 .
- Such an approach to vertical integration of a composite switch is disclosed in U.S. patent application Ser. No. 13/053,556, entitled “III-Nitride Transistor Stacked with FET in a Package,” and filed on Mar. 22, 2011. The entire disclosure in this patent application is hereby incorporated fully by reference into the present application.
- composite switch 220 in FIG. 2B corresponds in general to composite switch 220 in FIG. 2A .
- group IV FET 240 is a vertical channel FET having source 244 and gate 246 on a front or top side, and a drain on a back or bottom side of group IV FET 240 (drain of group IV FET 240 not visible in FIG. 2B ).
- vertical integration of group IV FET 240 and III-N FET 230 may be achieved by stacking the drain of group IV FET 240 on the back or bottom side of group IV FET 240 (not shown in FIG.
- FIG. 2B directly on source 234 of III-N FET 230 . Also shown in FIG. 2B are drain 232 and gate 236 of III-N FET 230 , and composite source 224 , composite drain 222 , and composite gate 226 of composite switch 220 .
- FIG. 3 shows integrated half-bridge circuit 310 with respective low side and high side composite switches 320 b and 320 a , according to one implementation.
- integrated half-bridge circuit 310 includes III-N body 360 including HV III-N FETs 330 b and 330 a monolithically integrated with and situated over LV group IV FET 340 b , which is shown to be fabricated in group IV layers 352 and 354 .
- integrated half-bridge circuit 310 also includes LV group IV FET 340 a stacked over III-N body 360 .
- LV group IV FET 340 b is cascoded with HV III-N FET 330 b to provide low side composite switch 320 b .
- drain 342 b of LV group IV FET 340 b is coupled to source 334 b of HV III-N FET 330 b , for example, by through-semiconductor via (TSV) 362 through III-N body 360 .
- source 344 b of LV group IV FET 340 b provides composite source 324 b for low side composite switch 320 b
- gate 346 b of LV group IV FET 340 b provides composite gate 326 b for low side composite switch 320 b .
- drain 332 b of HV III-N FET 330 b provides composite drain 322 b for low side composite switch 320 b.
- gate 336 b of HV III-N FET 330 b may be coupled to source 344 b of LV group IV FET 340 b using any of several techniques.
- gate 336 b of HV III-N FET 330 b may be coupled to source 344 b of LV group IV FET 340 b through use of a TSV, one or more bond wires, such as gold (Au) or copper (Cu) bond wires, for example, or by conductive ribbons, clips, or other connectors formed of conductive materials such as Al, Au, Cu, and/or other metals or composite materials.
- connection can be made through vias and patterned interconnects formed on one or more planarized insulating layers.
- LV group IV FET 340 b may be a vertical channel group IV FET having source 344 b and gate 346 b formed at a surface of N ⁇ group IV layer 354 serving as a drift region for LV group IV FET 340 b .
- N+ group IV layer 352 is situated between N ⁇ group IV layer 354 and III-N body 360 , and may provide drain 342 b of LV group IV FET 340 b .
- TSV 362 may extend through III-N body 360 to, but not into, N+ group IV layer 352 . However, in other implementations, TSV 362 may extend through some or all of N+ group IV layer 352 as well.
- LV group IV FET 340 b is described as a vertical channel FET in the exemplary implementation shown in FIG. 3 , in other implementations, LV group IV FET 340 b may be formed as a lateral channel FET.
- monolithically integrated III-N FETs and LV group IV FETs are disclosed in U.S. Pat. No. 7,915,645, entitled “Monolithic Vertically Integrated Composite Group III-V and Group IV Semiconductor Device and Method for Fabricating Same,” filed on May 28, 2009, and U.S. patent application Ser. No. 14/049,564, entitled “Monolithic Integrated Group III-V and Group IV Device,” filed on Oct. 9, 2013. The entire disclosures in this patent and patent application are hereby incorporated fully by reference into the present application.
- LV group IV FET 340 a is cascoded with HV III-N FET 330 a to provide high side composite switch 320 a .
- drain 342 a of LV group IV FET 340 a is coupled to source 334 a of HV III-N FET 330 a
- source 344 a of LV group IV FET 340 a provides composite source 324 a for high side composite switch 320 a
- gate 346 a of LV group IV FET 340 a provides composite gate 326 a for high side composite switch 320 a .
- drain 332 a of HV III-N FET 330 a provides composite drain 322 a for high side composite switch 320 a
- gate 336 a of HV III-N FET 330 a is coupled to source 344 a of LV group IV FET 340 a
- composite source 324 a of high side composite switch 320 a is coupled to composite drain 322 b of low side composite switch 320 b to provide switch node 312 of integrated half-bridge circuit 310 .
- Integrated half-bridge circuit 310 corresponds in general to integrated half-bridge circuit 110 , in FIG. 1 . That is to say, low side composite switch 320 b including LV group IV FET 340 b cascoded with HV III-N FET 330 b , and high side composite switch 320 a including LV group IV FET 340 a cascoded with HV III-N FET 330 a correspond respectively, in general, to low side composite switch 120 b including group IV FET 140 b cascoded with III-N FET 130 b , and high side composite switch 120 a including group IV FET 140 a cascoded with III-N FET 130 a . Moreover, switch node 312 , in FIG. 3 , corresponds in general to switch node 112 , in FIG. 1 .
- high side composite switch 320 a including LV group IV FET 340 a cascoded with HV III-N FET 330 a correspond to composite switch 220 including group IV FET 240 cascoded with III-N FET 230 , in FIG. 2 .
- LV group IV FETs 340 a and 340 b in FIG. 3
- HV III-N FETs 330 a and 330 b correspond to III-N FET 230 , and may share any of the characteristics attributed to those corresponding features, above.
- LV group IV FETs 340 a and 340 b may be implemented as vertical group IV FETs.
- LV group IV FET 340 a may be a vertical group IV FET having drain 342 a on a back or bottom side of LV group IV FET 340 a stacked on source 334 a of HV III-N FET 330 a .
- Stacking of LV group IV FET 340 a on top of HV III-N FET 330 a may be achieved using, for example, solder, conductive adhesive, conductive tape, sintering, or other attachment methods, resulting in formation of a direct mechanical and electrical contact between LV group IV FET 340 a and HV III-N FET 330 a .
- Another example of direct stacking of a vertical LV group IV FET onto a HV III-N FET is disclosed in U.S. patent application Ser. No. 13/053,556, entitled “III-Nitride Transistor Stacked with FET in a Package,” filed on Mar. 22, 2011 and claiming priority to provisional patent application Ser. No. 61/448,347, entitled “III-Nitride Transistor Stacked with FET in a Package,” filed Mar. 2, 2011. The entire disclosures in these patent applications are hereby incorporated fully by reference into the present application.
- Direct attachment for example through stacking, of LV group IV FET 340 a over the monolithically integrated combination of LV group IV FET 340 b with HV III-N FETs 330 a and 330 b can advantageously reduce parasitic inductance and resistance, improve thermal dissipation, and reduce form factor and manufacturing costs for integrated half-bridge circuit 310 compared to conventional half-bridge circuit designs using discrete switches.
- LV group IV FET 340 a is described as a vertical channel FET in the exemplary implementation shown in FIG. 3 , in other implementations, LV group IV FET 340 a may be formed as a lateral channel FET. Furthermore, LV group IV FET 340 a may also be monolithically integrated using the same substrate as the III-N FETs Examples of monolithic integration of LV group IV FET 340 a and HV III-Nitride FET 330 a including the via connections between the two devices are described in U.S. Pat. No. 7,915,645 and U.S. patent application Ser. No. 12/174,329, both of which are referenced above and have their entire disclosures incorporated fully by reference into the present application.
- composite switch 320 a is described as the high side composite switch in the implementation of integrated half-bridge circuit 310 shown in FIG. 3
- composite switch 320 b is described as the low side composite switch
- those representations are merely exemplary.
- composite switch 320 b may be implemented as the high side composite switch
- composite switch 320 a may function as the low side composite switch of integrated half-bridge circuit 310 .
- composite source 324 b of composite switch 320 b would be coupled to composite drain 322 a of composite switch 320 a to provide switch node 312 of integrated half-bridge circuit 310 .
- FIG. 4 shows integrated half-bridge circuit 410 with respective low side and high side composite switches 420 b and 420 a , according to another implementation.
- integrated half-bridge circuit 410 includes LV group IV FET 440 b stacked under group IV substrate 450 .
- integrated half-bridge circuit 410 includes III-N body 460 including HV FETs 430 b and 430 a situated over group IV substrate 450 .
- integrated half-bridge circuit 410 also includes LV group IV FET 440 a stacked over III-N body 460 .
- LV group IV FET 440 b is cascoded with HV III-N FET 430 b to provide low side composite switch 420 b .
- drain 442 b of LV group IV FET 440 b is coupled to source 434 b of HV III-N FET 430 b , for example, by TSV 464 through III-N body 460 .
- source 444 b of LV group IV FET 440 b provides composite source 424 b for low side composite switch 420 b
- gate 446 b of LV group IV FET 440 b provides composite gate 426 b for low side composite switch 420 b .
- drain 432 b of HV III-N FET 430 b provides composite drain 422 b for low side composite switch 420 b .
- gate 436 b of HV III-N FET 430 b may be coupled to source 444 b of LV group IV FET 440 b using any of several techniques.
- gate 436 b of HV III-FET 430 b may be coupled to source 444 b of LV group IV FET 440 b through use of a TSV, one or more bond wires, such as Au or Cu bond wires, for example, or by conductive ribbons, clips, or other connectors formed of conductive materials such as Al, Au, Cu, and/or other metals or composite materials.
- bond wires such as Au or Cu bond wires
- conductive ribbons, clips, or other connectors formed of conductive materials such as Al, Au, Cu, and/or other metals or composite materials.
- connections can be made external to the semiconductor device construction, for example in the semiconductor package or a printed circuit board (PCB) serving as a mounting surface for the semiconductor package, provided that such connections exhibit sufficiently low parasitic resistance and inductance.
- PCB printed circuit board
- LV group IV FET 440 b may be a vertical group IV FET.
- TSV 464 may extend through III-N body 460 and through group IV substrate 450 to contact drain 442 b of LV group IV FET 440 b .
- group IV substrate 450 may be a conductive substrate, and TSV 464 may extend through III-N body to, or into, but not through, group IV substrate 450 .
- LV group IV FET 440 b may take the form of a DirectFET® or other flip chip, or may be implemented as a direct-mount chip scale FET package that is inverted such that III-N body 460 is attached to the drain side of packaged LV group IV FET 440 b .
- chip scale packaging are disclosed in U.S. Pat. No. 6,624,522, entitled “Chip Scale Surface Mounted Device and Process of Manufacture,” filed on Mar. 28, 2001, and issued on Sep. 23, 2003. The entire disclosure in this patent is hereby incorporated fully by reference into the present application.
- LV group IV FET 440 a is cascoded with HV III-N FET 430 a to provide high side composite switch 420 a .
- drain 442 a of LV group IV FET 440 a is coupled to source 434 a of HV III-N FET 430 a
- source 444 a of LV group IV FET 440 a provides composite source 424 a for high side composite switch 420 a
- gate 446 a of LV group IV FET 440 a provides composite gate 426 a for high side composite switch 420 a .
- drain 432 a of HV III-N FET 430 a provides composite drain 422 a for high side composite switch 420 a
- gate 436 a of HV III-N FET 430 a is coupled to source 444 a of LV group IV FET 440 a
- composite source 424 a of high side composite switch 420 a is coupled to composite drain 422 b of low side switch 420 b to provide switch node 412 of integrated half-bridge circuit 410 .
- Integrated half-bridge circuit 410 corresponds in general to integrated half-bridge circuit 110 , in FIG. 1 . That is to say, low side composite switch 420 b including LV group IV FET 440 b cascoded with HV III-N FET 430 b , and high side composite switch 420 a including LV group IV FET 440 a cascoded with HV III-N FET 430 a correspond respectively, in general, to low side composite switch 120 b including group IV FET 140 b cascoded with III-N FET 130 b , and high side composite switch 120 a including group IV FET 140 a cascoded with III-N FET 130 a . Moreover, switch node 412 , in FIG. 4 , corresponds in general to switch node 112 , in FIG. 1 .
- high side composite switch 420 a including LV group IV FET 440 a cascoded with HV FET 430 a correspond to composite switch 220 including group IV FET 240 cascoded with III-N FET 230 , in FIG. 2 .
- LV group IV FETs 440 a and 440 b in FIG. 4
- HV III-N FETs 430 a and 430 b correspond to III-N FET 230 , and may share any of the characteristics attributed to those corresponding features, above.
- LV group IV FETs 440 a and 440 b may be implemented as vertical group IV FETs.
- LV group IV FET 440 a may be a vertical group IV FET having drain 442 a on a back or bottom side of LV group IV FET 440 a stacked on source 434 a of HV III-N FET 430 a .
- Stacking of LV group IV FET 440 a on top of HV III-N FET 430 a may be achieved using, for example, solder, conductive adhesive, conductive tape, sintering, or other attachment methods, resulting in formation of a direct mechanical contact between LV group IV FET 440 a and HV III-N FET 430 a.
- composite switch 420 a is described as the high side composite switch in the implementation of integrated half-bridge circuit 410 shown in FIG. 4
- composite switch 420 b is described as the low side composite switch
- those representations are merely exemplary.
- composite switch 420 b may be implemented as the high side composite switch
- composite switch 420 a may function as the low side composite switch of integrated half-bridge circuit 410 .
- composite source 424 b of composite switch 420 b would be coupled to composite drain 422 a of composite switch 420 a to provide switch node 412 of integrated half-bridge circuit 410 .
- the present application discloses an integrated half-bridge circuit including low side and high side composite switches.
- the present application discloses solutions resulting in a highly integrated half-bridge circuit. Consequently, various implementations of the present solution can advantageously reduce parasitic inductance and resistance, improve thermal dissipation, and reduce form factor and manufacturing costs compared to conventional half-bridge circuit designs.
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JP2014020452A JP5856197B2 (en) | 2013-02-11 | 2014-02-05 | Integrated half-bridge circuit with combined low-voltage and high-voltage switches |
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Also Published As
Publication number | Publication date |
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EP2765598A3 (en) | 2017-11-01 |
JP5856197B2 (en) | 2016-02-09 |
US20140225162A1 (en) | 2014-08-14 |
EP2765598A2 (en) | 2014-08-13 |
JP2014179588A (en) | 2014-09-25 |
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